In the performing arts, such as music and dance performances, people actively interact with each other and show their exciting performances. Some studies have proposed that this interaction is a social origin of the performing arts. Some have further investigated this phenomenon based on the synchronization and coordination theory. Though the majority of these studies have focused on the collaborative context, several genres of the performing arts, such as jazz sessions and breakdance battles, have a competitive context. Several studies have suggested that, in this competitive context, performers actively interact with each other and construct some correspondence. Moreover, a few recent studies focusing on competitive conversations, such as debates, have shown that, compared to people's interactions in collaborative conversations, people in competitive contexts frequently coordinate their behaviors in complicated ways. However, the interaction and coordination among performers in these competitive contexts have not been sufficiently investigated. Therefore, we investigated the coordination of expert breakdancers in battle scenes and measured their rhythmic movements using a motion capture system. We calculated the relative phase of the rhythmic movements between two dancers to investigate their coordination. The results showed that the dancers' rhythmic movements tended to synchronize in an anti-phase fashion, which means that there were similarities as well as differences between the two dancers' rhythmic movements. Furthermore, this pattern of coordination changed dynamically as time elapsed, from an in-phase synchronization or leader-follower relationships to an anti-phase synchronization and then leader-follower relationships.

在表演艺术中，例如音乐和舞蹈表演，人们相互之间进行积极互动并展示出他们激动人心的表演。一些研究提出，这种互动是表演艺术的社会渊源。一些人根据同步和协调理论进一步研究了这种现象。尽管这些研究大多数都集中在合作环境上，但表演艺术的几种流派（例如爵士音乐节和霹雳舞大战）却具有竞争性。多项研究表明，在这种竞争环境下，表演者之间会积极互动并建立某种对应关系。此外，最近一些针对竞争性对话（例如辩论）的研究表明，与人们在协作性对话中的互动相比，竞争环境中的人们经常以复杂的方式协调他们的行为。然而，在这些竞争环境中，表演者之间的互动和协调还没有得到充分的研究。因此，我们调查了运动场景中专业霹雳舞者的协调能力，并使用运动捕捉系统测量了他们的节奏运动。我们计算了两个舞者之间节奏运动的相对相位，以研究其协调性。结果表明，舞者的节奏动作倾向于以反相的方式同步，这意味着两位舞者的节奏动作既有相似之处，也有差异。此外，这种协调模式会随着时间的流逝而动态变化，